US4148305A
Expired / Lapsed
US
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Cathode for polarographic measurements in physiological medium
Assignee: Siemens AG
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Filing: 1977-03-02
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Granted: 1979-04-10
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Expires: 1997-03-02
Abstract
Abstract A cathode for polarographic measurements in physiological medium, such as measuring oxygen partial pressure in a human or animal body, is comprised of an elongated cable having a conductive filament, such as a steel wire or a carbon fiber enveloped within an insulating material, such as a layer of polyurethane and sheated in a body-tolerable insulating material, such as a layer of polytetrafluoroethylene. The proximal end of the conductive filament is coated with a layer of a precious metal, such as gold or platinum, and the front face of the cable is provided with a layer of an oxygen-permeable electrically conductive membrane, such as composed of polymethylacrylate or polystyrene. The distal end of the conductive filament is connected to an electrical source, a signal display means and/or a signal processing means.
Inventors
- 👤 Helmut Reichenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:58
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/1468; A61B5/1473; G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
In a cathode for polarographic measurements in physiological medium, such as for measuring oxygen partial pressure in a human or animal body, comprised of an elongated insulated conductive cable, having a distal end thereof operationally connected to an electrical source and a signal display or processing means, and having a proximal end thereof covered with an oxygen-permeable electrically conductive membrane and operationally connected with an anode via a physiological medium; the improvement comprising: wherein said conductive cable has an elongated substantially round filament therein comprised of an electrically conductive non-precious material, said filament having a definite diameter dimension less than that of said conductive cable, and a relatively thin layer of a precious metal coating positioned directly on a proximal end face of said filament, said precious metal thin layer having a diameter dimension substantially equal to that of said filament.
Claim 2
Dependent Claim
141 words
In a cathode for polarographic measurements in physiological medium, such as for measuring oxygen partial pressure in a human or animal body, comprised of an elongated insulated conductive cable, having a distal end thereof operationally connected to an electrical source and a signal display or processing means, and having a proximal end thereof covered with an oxygen-permeable electrically conductive membrane and operationally connected with an anode via a physiological medium; the improvement comprising: wherein said conductive cable has an elongated substantially round filament therein comprised of an electrically conductive non-precious material, said filament having a definite diameter dimension less than that of said conductive cable, and a relatively thin layer of a precious metal coating positioned directly on a proximal end face of said filament, said precious metal thin layer having a diameter dimension substantially equal to that of said filament.
Claim 3
Dependent Claim
39 words
In a cathode as defined in claim 1 wherein said filament is composed of a material selected from the group consisting of steel and carbon and said precious metal is selected from the group consisting of gold and platinum.
Claim 4
Dependent Claim
31 words
In a cathode as defined in claim 1 wherein said oxygen-permeable electrically conductive membrane is composed of a material selected from the group consisting of cross-linked polymethylacrylate, polystyrene and cellulose acetate.
Claim 5
Dependent Claim
27 words
In a cathode as defined in claim 1 wherein said definite diameter dimension of said filament is in a range from about 10 to about 100 micrometers.
Claim 6
Dependent Claim
132 words
A cathode for polarographic measurements in physiological medium, such as for measuring oxygen partial pressure in a human or animal body, comprising: an elongated electrically conductive filament having a distal end and a proximal end, said filament having a definite diameter and being composed of an electrically conductive non-precious material; a relatively thin layer coating composed of a precious metal positioned directly on only a proximal end face of said filament, said precious metal coating having a diameter dimension substantially equal to that of said filament; an insulating envelope about said filament and absent from the distal and proximal ends thereof; an external sheathing composed of a body-tolerable material about said insulating envelope; and an oxygen-permeable electrically conductive membrane on at least a free face of said thin layer of precious metal.
Claim 7
Dependent Claim
132 words
A cathode for polarographic measurements in physiological medium, such as for measuring oxygen partial pressure in a human or animal body, comprising: an elongated electrically conductive filament having a distal end and a proximal end, said filament having a definite diameter and being composed of an electrically conductive non-precious material; a relatively thin layer coating composed of a precious metal positioned directly on only a proximal end face of said filament, said precious metal coating having a diameter dimension substantially equal to that of said filament; an insulating envelope about said filament and absent from the distal and proximal ends thereof; an external sheathing composed of a body-tolerable material about said insulating envelope; and an oxygen-permeable electrically conductive membrane on at least a free face of said thin layer of precious metal.
Claim 8
Dependent Claim
25 words
A cathode as defined in claim 5 wherein said conductive filament is composed of a material selected from the group consisting of steel and carbon.
Claim 9
Dependent Claim
21 words
A cathode as defined in claim 5 wherein said precious metal is selected from the group consisting of gold and platinum.
Claim 10
Dependent Claim
28 words
A cathode as defined in claim 5 wherein said oxygen-permeable membrane is composed of a material selected from the group consisting of cross-linked polymethylacrylate, polystyrene and cellulose acetate.
Claim 11
Dependent Claim
27 words
A cathode as defined in claim 5 including means for supplying an electrical potential to said cathode and for displaying and processing signals received from said cathode.
Claim 12
Dependent Claim
25 words
A cathode as defined in claim 5 wherein said definite diameter of the filament is in the range of about 10 to about 100 micrometers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |